Nikaah & Marriage Issues

Giving more mahr to the second wife

Q: In Islam, a man is allowed to get married to 4 women. If he wants to marry a girl when he already has his first wife, does he have to mention the same amount of mehar that he had given to his first wife or can he give his second wife more than what he gave the first wife as mehar.

If he wants to give his second wife more mehar than the first wife's mehar, is there any problem in that or should he maintain an equal amount of money for both?

Husband taking a Christian as a second wife and ill-treating the first wife

Q:

1. My husband married a Christiam girl who didn't convert to Islam. Is the nikaah valid?

2. He stays 1 night only with us and its affecting my children now. Is this permissible? He treats me, as a first wife, very badly. He talks rudely to me and is always angry with me. His 2nd family is always treated well.

Witnesses being present when taking consent from the girl at home before the nikaah

Q: In my country, before the actual nikaah, the qadhi goes to the bride's house to get her signature. Some people insist that there should be 2 witnesses there and some say no since this is not an actual nikaah but just to confirm that the bride has given her permission.

What is the ruling here? Should there be 2 witnesses when the bride gives her approval at her house and they have to be present in the nikaah to confirm that OR the mere statement of a wali during the nikaah (that my daughter has given her approval) is taken to be sufficient without the involvement of any witness (to confirm the above)?

Wife seeking husband's permission to go sleep

Q: At 6pm I feed my family. My husband comes late so he eats at 8pm earliest. I try to have my kitchen clean by the time I go to bed at 9pm or 10pm. I check on my husband. We sleep seperate (not ideal but it is what it is). I say goodnight to him and I go to my bed.

Sometimes he tells me that I am not allowed to go to sleep unless he gives me permission to go sleep? Am I disobedient if I go sleep?

This statement makes me feel like a slave and not like a wife.

Is this the level of obedience a wife must give to seek permission for basic human needs?